nodejs console repl Node.js

Node.js provides a built-in interactive console environment called the REPL (Read-Eval-Print Loop) that allows you to quickly test and experiment with Node.js code. The REPL provides a prompt where you can enter JavaScript code and see the output immediately.

To launch the Node.js REPL, open your terminal or command prompt and type node. This will start the Node.js runtime environment and display the > prompt.

You can then type any valid JavaScript code and press Enter to see the result. For example, typing 2 + 2 and pressing Enter will output 4. You can also define variables, create functions, and use any of the built-in Node.js modules.

To exit the REPL, type .exit or press Ctrl+C twice. You can also use the commands .help to see a list of available commands, and .break to exit out of a multiline expression.

The Node.js REPL is a useful tool for quickly testing and experimenting with Node.js code, as well as for debugging and troubleshooting. It is often used in conjunction with the Node.js debugger to step through code and inspect variables.